Characteristics of electrochemically synthesized polymer electrodes in lithium cells—III. Polypyrrole

Abstract

The characteristics of electrochemically synthesized polypyrrole electrodes have been examined in the lithium perchlorate-propylene carbonate electrolyte, by cyclic voltammetry, charge-discharge cycling, frequency response analysis and by vis-near ir absorbtion spectra. The results show that these polymer electrodes behave satisfactorily in terms of kinetics of the electrochemical doping process, cyclability and charge-discharge efficiency. However, their performance under high rates may be limited by the diffusion of the perchlorate counterion. The preliminary evaluation seems to indicate that polypyrrole may be more stable than other conducting polymers in organic electrolytes of interest for the development of rechargeable lithium batteries.